diff --git a/build/params_2k.go b/build/params_2k.go
index 103dc7802..1a63af5fa 100644
--- a/build/params_2k.go
+++ b/build/params_2k.go
@@ -6,6 +6,8 @@ import (
 	"os"
 	"strconv"
 
+	"github.com/ipfs/go-cid"
+
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
 )
@@ -91,3 +93,5 @@ const SlashablePowerDelay = 20
 const InteractivePoRepConfidence = 6
 
 const BootstrapPeerThreshold = 1
+
+var WhitelistedBlock = cid.Undef
diff --git a/build/params_butterfly.go b/build/params_butterfly.go
index 579e019b1..3e9dbbbb8 100644
--- a/build/params_butterfly.go
+++ b/build/params_butterfly.go
@@ -7,6 +7,7 @@ import (
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
 	builtin2 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
+	"github.com/ipfs/go-cid"
 )
 
 var DrandSchedule = map[abi.ChainEpoch]DrandEnum{
@@ -51,3 +52,5 @@ const PropagationDelaySecs = uint64(6)
 
 // BootstrapPeerThreshold is the minimum number peers we need to track for a sync worker to start
 const BootstrapPeerThreshold = 2
+
+var WhitelistedBlock = cid.Undef
diff --git a/build/params_calibnet.go b/build/params_calibnet.go
index 83cf10856..10d29e564 100644
--- a/build/params_calibnet.go
+++ b/build/params_calibnet.go
@@ -7,6 +7,7 @@ import (
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
 	builtin2 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
+	"github.com/ipfs/go-cid"
 )
 
 var DrandSchedule = map[abi.ChainEpoch]DrandEnum{
@@ -62,3 +63,5 @@ const PropagationDelaySecs = uint64(6)
 
 // BootstrapPeerThreshold is the minimum number peers we need to track for a sync worker to start
 const BootstrapPeerThreshold = 4
+
+var WhitelistedBlock = cid.Undef
diff --git a/build/params_mainnet.go b/build/params_mainnet.go
index 635bbc679..d14b97e0f 100644
--- a/build/params_mainnet.go
+++ b/build/params_mainnet.go
@@ -81,3 +81,6 @@ const PropagationDelaySecs = uint64(6)
 
 // BootstrapPeerThreshold is the minimum number peers we need to track for a sync worker to start
 const BootstrapPeerThreshold = 4
+
+// we skip checks on message validity in this block to sidestep the zero-bls signature
+var WhitelistedBlock = MustParseCid("bafy2bzaceapyg2uyzk7vueh3xccxkuwbz3nxewjyguoxvhx77malc2lzn2ybi")
diff --git a/build/params_nerpanet.go b/build/params_nerpanet.go
index 1d051a908..385000992 100644
--- a/build/params_nerpanet.go
+++ b/build/params_nerpanet.go
@@ -5,6 +5,7 @@ package build
 import (
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
+	"github.com/ipfs/go-cid"
 
 	builtin2 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
 )
@@ -71,3 +72,5 @@ const PropagationDelaySecs = uint64(6)
 
 // BootstrapPeerThreshold is the minimum number peers we need to track for a sync worker to start
 const BootstrapPeerThreshold = 4
+
+var WhitelistedBlock = cid.Undef
diff --git a/build/params_shared_funcs.go b/build/params_shared_funcs.go
index bcd82bb48..f59fee653 100644
--- a/build/params_shared_funcs.go
+++ b/build/params_shared_funcs.go
@@ -2,6 +2,7 @@ package build
 
 import (
 	"github.com/filecoin-project/go-address"
+	"github.com/ipfs/go-cid"
 
 	"github.com/libp2p/go-libp2p-core/protocol"
 
@@ -28,3 +29,12 @@ func MustParseAddress(addr string) address.Address {
 
 	return ret
 }
+
+func MustParseCid(c string) cid.Cid {
+	ret, err := cid.Decode(c)
+	if err != nil {
+		panic(err)
+	}
+
+	return ret
+}
diff --git a/build/params_testground.go b/build/params_testground.go
index e7c428368..11a823fcf 100644
--- a/build/params_testground.go
+++ b/build/params_testground.go
@@ -12,6 +12,7 @@ import (
 
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/network"
+	"github.com/ipfs/go-cid"
 
 	builtin2 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
 
@@ -105,6 +106,7 @@ var (
 	Devnet      = true
 	ZeroAddress = MustParseAddress("f3yaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaby2smx7a")
 
+	WhitelistedBlock  = cid.Undef
 	BootstrappersFile = ""
 	GenesisFile       = ""
 )
diff --git a/chain/sync.go b/chain/sync.go
index 88237eb5a..66c9c18bd 100644
--- a/chain/sync.go
+++ b/chain/sync.go
@@ -751,6 +751,10 @@ func (syncer *Syncer) ValidateBlock(ctx context.Context, b *types.FullBlock, use
 	}
 
 	msgsCheck := async.Err(func() error {
+		if b.Cid() == build.WhitelistedBlock {
+			return nil
+		}
+
 		if err := syncer.checkBlockMessages(ctx, b, baseTs); err != nil {
 			return xerrors.Errorf("block had invalid messages: %w", err)
 		}
diff --git a/cmd/lotus-shed/signatures.go b/cmd/lotus-shed/signatures.go
index fa6698cf8..d287e0c3f 100644
--- a/cmd/lotus-shed/signatures.go
+++ b/cmd/lotus-shed/signatures.go
@@ -90,6 +90,7 @@ var sigsVerifyBlsMsgsCmd = &cli.Command{
 			return xerrors.New("bls aggregate signature failed to verify")
 		}
 
+		fmt.Println("BLS siggys valid!")
 		return nil
 	},
 }